应该光油点击触摸PHP？

我有一个相当大的Drupal网站坐在一个4GB的内存盒子上光油。 我曾经想过（希望？假设？）在Nginx / PHP-FPM之前站在Varnish的位置将会减轻PHP的负担，但是PHP似乎仍然非常活跃，并且我得到了更多的警告：内存已经超过了90％预计会得到。

我从根本上误解了什么Varnish？ 我的期望是，它将caching完整的HTTP响应，只是caching它，如果所请求的URL在caching中，就不会向Nginx发送请求，更不用说PHP了。 然而，在和我所知道的有关这个话题的人们交谈的时候，我正在得到一些可能会指出的信息。

任何人都可以填补这些差距？ 在Drupal站点中， 绝大多数stream量是匿名的，因此受到光油caching的影响，我们应该期望从Varnish中获得什么？

UPDATE

• caching设置为我的networking服务器（varnish，bcache）
• 让cPanel上的apache监听8080
• 清漆：caching和非caching的子域名
• 在默认端口运行Apache
• 防止用户在使用光油（端口80）时使用端口8080（apache）访问网站，

根据请求，这里是我的configuration（ default.vcl – 也在一个要点 ）：

 backend default { .host = "127.0.0.1"; .port = "8080"; } acl purge { # Add local/internal server IPs "localhost"; "127.0.0.1"; } sub vcl_recv { if (req.http.User-Agent ~ "MS Search (5|6).0 Robot") { error 403 "Forbidden"; } if (req.http.User-Agent ~ "Microsoft-WebDAV-MiniRedir") { error 403 "Forbidden"; } remove req.http.ETAG; remove req.http.X-Generator; set req.grace = 30m; if (req.url ~"apc.php") { return (pass); } set req.http.host = regsuball(req.http.host, ":.*", ""); if (req.request == "PURGE") { if (!client.ip ~ purge) { error 405 "Not allowed."; } return(lookup); } if (req.restarts == 0) { if (req.http.x-forwarded-for) { set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip; } else { set req.http.X-Forwarded-For = client.ip; } } #--Add Server Status Exclusion if (req.url ~ "/status") { if (client.ip ~ purge) { return(pass); } else { error 750 "http://"+req.http.host; } } #--Add Munin Exclusion if (req.url ~ "munin") { set req.backend = default; set req.http.X-Cache = "Default-Pass"; return(pass); } # Handle compression correctly. Different browsers send different # "Accept-Encoding" headers, even though they mostly all support the same # compression mechanisms. By consolidating these compression headers into # a consistent format, we can reduce the size of the cache and get more hits.= # @see: http://varnish.projects.linpro.no/wiki/FAQ/Compression # Properly handle different encoding types if (req.http.Accept-Encoding) { if (req.url ~ "(?i)\.(bmp|bz2|gif|gz|ico|img|jpeg|jpg|lzma|mp3|ogg|png|swf|tbz|tga|tgz|wmf|zip)(\?.*|)$") { remove req.http.Accept-Encoding; } else if (req.http.Accept-Encoding ~ "gzip") { set req.http.Accept-Encoding = "gzip"; } else if (req.http.Accept-Encoding ~ "deflate") { set req.http.Accept-Encoding = "deflate"; } else { remove req.http.Accept-Encoding; } } if ( req.restarts > 0 && req.url ~ "(?i)\.(bmp|bz2|css|gif|gz|ico|img|jpeg|jpg|js|lzma|mp3|ogg|png|swf|tbz|tga|tgz|txt|wmf|zip)(\?.*|)$" ) { return(lookup); } if ( req.restarts > 0 || req.http.Content-Type ~ "multipart/form-data" || req.http.X-Requested-With == "XMLHttpRequest" #dont cache ajax requests || req.url ~ "nocache" #|| req.request == "POST" #never cache POST requests || req.url ~ "/(delete|add|edit|update)|render=media" #--Dont intercept "itok=" #-- || req.url ~ "itok=" || ( req.http.Referer ~ "/(delete|add|edit|update)" ) || req.url ~ "/(upload/profileimage|upload/bannerimage|docbldr/api/uploadimage2|db/item/save)" || req.http.Referer ~ "/(upload/profileimage|upload/bannerimage|docbldr/api/uploadimage2|db/item/save)" ) { return(pass); } # Allow the backend to serve up stale content if it is responding slowly. # Do not cache these paths. if (req.url ~ "^/status\.php$" || req.url ~ "^/update\.php$" || req.url ~ "^/ooyala/ping$" || req.url ~ "^/admin/build/features" || req.url ~ "^/info/.*$" || req.url ~ "^/flag/.*$" || req.url ~ "^.*/ajax/.*$" || req.url ~ "^.*/ahah/.*$" ) { return (pass); } # Do not allow outside access to cron.php or install.php. if (req.url ~ "^/(cron|install)\.php$" && !client.ip ~ purge) { error 404 "Page not found."; } #--If POST requests don't include file uploads and the master is being overwhelmed by POSTS, uncomment below and comment out the POST line above if ( req.request == "POST" #never cache POST requests || req.url ~ "(admin|login)" ) { return(pass); } ## always cache these images & static assets ## MUST OCCUR AFTER "req.restart" CHECK ABOVE! if (req.request ~ "GET|HEAD" && (req.url ~ "(?i)\.(bmp|bz2|css|gif|gz|ico|img|jpeg|jpg|js|lzma|mp3|ogg|png|swf|tbz|tga|tgz|txt|wmf|zip)(\?.*|)$" )) { remove req.http.cookie; return(lookup); } ### don't cache authenticated sessions if (req.http.Cookie && req.http.Cookie ~ "(PHPSESSID|^SESS)") { return(pass); } # DO cache this ajax request. # WordPress if(req.http.X-Requested-With == "XMLHttpRequest" && req.url ~ "recent_reviews") { return (lookup); } # Remove all cookies that Drupal doesn't need to know about. ANY remaining # cookie will cause the request to pass-through to Apache. For the most part # we always set the NO_CACHE cookie after any POST request, disabling the # Varnish cache temporarily. The session cookie allows all authenticated users # to pass through as long as they're logged in. if (req.http.Cookie) { set req.http.Cookie = ";" + req.http.Cookie; set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";"); set req.http.Cookie = regsuball(req.http.Cookie, ";(SESS[a-z0-9]+|NO_CACHE)=", "; \1="); set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", ""); set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", ""); if (req.http.Cookie == "") { unset req.http.Cookie; return(lookup); } else { return (pass); } } return (lookup); } sub vcl_hit { if (req.request == "PURGE") { purge; error 200 "Purged."; } } sub vcl_miss { if (req.request == "PURGE") { error 404 "Not in cache."; } if (req.url ~ "(?i)\.(bmp|bz2|css|gif|gz|ico|img|jpeg|jpg|js|lzma|mp3|ogg|png|swf|tbz|tga|tgz|txt|wmf|zip)(\?.*|)$") { unset req.http.cookie; set req.url = regsub(req.url, "\?.*", ""); } } sub vcl_hash { hash_data(req.url); if (req.http.host) { hash_data(req.http.host); } else { hash_data(server.ip); } if (req.http.x-forwarded-proto) { hash_data(req.http.x-forwarded-proto); } return (hash); } sub vcl_fetch { set beresp.grace = 30m; remove beresp.http.ETAG; remove beresp.http.X-Generator; remove beresp.http.Link; remove beresp.http.Server; if (beresp.status == 404 && req.restarts == 0) { return(restart); } # Keep static content in Browser Cache and Varnish Cache for a while. Tweak as needed. if (req.url ~ "(?i)\.(bmp|bz2|css|gif|gz|ico|img|jpeg|jpg|js|lzma|mp3|ogg|png|swf|tbz|tga|tgz|txt|wmf|zip)(\?.*|)$") { #-- Prevent Varnish from caching unsuccessful static requests if (beresp.status != 200 && req.restarts == 0) { return(restart); } unset beresp.http.set-cookie; set beresp.http.cache-control = "max-age=3600; public"; set beresp.ttl = 1800s; } set beresp.http.X-Host = req.http.host; set beresp.http.X-URL = req.url; # make Varnish compress content before storing it in cache and store text content for a while. if (beresp.http.content-type ~ "text") { set beresp.ttl = 1800s; set beresp.do_gzip = true; } } sub vcl_error { # Redirect to some other URL in the case of a homepage failure. if (obj.status == 750) { set obj.http.Location = obj.response; set obj.status = 302; return(deliver); } # Otherwise redirect to the homepage, which will likely be in the cache. set obj.http.Content-Type = "text/html; charset=utf-8"; synthetic {" <html> <head> <title>Page Unavailable</title> <style> body { background: #303030; text-align: center; color: white; } #page { border: 1px solid #CCC; width: 500px; margin: 100px auto 0; padding: 30px; background: #323232; } a, a:link, a:visited { color: #CCC; } .error { color: #FFF;font-size:24px;padding:15px; } </style> </head> <body onload="setTimeout(function() { window.location = '"} + req.url + {"' }, 5000)"> <div id="page"> <h1 class="title">Page Unavailable</h1> <p>The page you requested is temporarily unavailable.</p> <p>We'll try again in 5 seconds.</p> <div class="error">(Error "} + obj.status + " " + obj.response + {")</div> </div> </body> </html> "}; return (deliver); } sub vcl_deliver { } 

 varnishncsa -f -m 'TxHeader:X-Cache: MISS'